The button never rendered: it filtered spaces to writable ones via a
CASL ability built from membership.permissions, but the /spaces list
endpoint returns membership.role only (permissions come from
/spaces/info). The empty ability hid the button for everyone.
Resolve writability from membership.role instead, mirroring the server
space-ability mapping (ADMIN and WRITER can manage pages, READER is
read-only). Drop the now-unused CASL imports.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
93d8c1f775